BREW-nx-CVE-2026-54753 — `nx graph` dev server permissive CORS policy

Affected: Homebrew: nx

## Summary

The local HTTP server started by `nx graph` sent `Access-Control-Allow-Origin: *` on every response, letting any website a developer visited read the server's responses cross-origin — including the full project graph and the output of the `/help` endpoint, which runs a target's configured help command. The practical impact is typically **cross-origin information disclosure**, but can be arbitrary command injection in rare cases.

## Severity

Exploitation requires the developer to be running `nx graph` and to visit an attacker page. Any execution beyond benign help commands also requires a malicious target to already be present in the workspace (see Details).

## Affected & Patched Versions

Package: `nx` (npm).

- **Affected:** `>= 17.0.4, < 22.7.2` and `>= 23.0.0-beta.0, < 23.0.0-beta.2` - **Patched:** `22.7.2`+ (backport) and `23.0.0` (first in `23.0.0-beta.2`)

The wildcard CORS header was introduced in `17.0.4`; the `/help` execution endpoint in `19.4.0`. **The `21.x` line is not patched** — `21.x` users should upgrade to `22.7.2` or later.

## Details

`nx graph` starts a local server (default `http://127.0.0.1:4211`). Before the fix, its request handler set a wildcard CORS header on every response:

```ts res.setHeader('Access-Control-Allow-Origin', '*'); ```

The `/help` endpoint runs a target's configured command:

```ts const command = target.metadata?.help?.command; return execSync(command, { cwd: target.options?.cwd ?? workspaceRoot }).toString(); ``…

CVE-2026-54753 — Nx: `nx graph` dev server permissive CORS policy

Affected: nrwl nx

Nx is a monorepo solution for TypeScript and polyglot codebases. From 17.0.4 until 22.7.2 and 23.0.0-beta.2, the local HTTP server started by nx graph sent Access-Control-Allow-Origin: * on every response, letting any website a developer visited read the server's responses cross-origin — including the full project graph and the output of the /help endpoint, which runs a target's configured help command. The practical impact is typically cross-origin information disclosure, but can be arbitrary command injection in rare cases. This vulnerability is fixed in 22.7.2 and 23.0.0-beta.2.

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BREW-nx-CVE-2026-54753 — `nx graph` dev server permissive CORS policy

CVE-2026-54753 — Nx: `nx graph` dev server permissive CORS policy